here is a copy of an email i recieved from the cws regarding importing cites1 snakes.
and as far as i know even corn snakes are cites listed, but on appendix III
In response to your e-mail of May 30 the importation of a Dumeril's boa (Acrantophis dumerili) and Argentine Boa Constrictor (Boa constrictor occidentalis) are both regulated by CITES. Since they are species listed on CITES Appendix I, you need to obtain both a CITES import permit from the importing country and a CITES export permit from the exporting country.
The importation of a CITES Appendix I species is not authorized for commercial purpose. The importation could be authorized for other purposes such as breeding, but you need to demonstrate that you possess the experience, the knowledge and the adequate installations to house and care for the boas. In general, it is very difficult for an amateur to import CITES Appendix I species.
The Canadian CITES import permits are issued by our office. If you think that you meet the requirements for the experience, knowledge and installations, you could send me your complete address and I will mail you an application form or you could go to our website to obtain one at www.cites.ca
To obtain a U.S. CITES export permit you need to contact the US Fish and Wildlife at Tel: 703-2104 or fax: 703-358-2281. Website: http://permits.fws.gov/
They can also provide you with additional information.
Note the importation of a live animals into Canada may require the prior grant of an import permit required under Canada's Health of Animals Regulations and issued by the Canadian Food Inspection Agency (CFIA). You may reach them at 1-877-493-0468, 1-800-835-4486, 1-888-732-6222.
Regarding microchipping boas as a method of identification, in Canada CITES does not have any law, but often animal owners get their veterinarians to microchip their animals. I suggest you verify with the U.S. Fish and Wildlife Service for their own laws.
Please do not hesitate to contact me if you need additional information.
Canadian Wildlife Service
Telephone: (819) 953-1408
FAX: (819) 953-6283